It wont show an error page it just crashes and returns to joiplayWhat is so hard to play it in joiplay? I can play it easily. Just make sure to read what is in the error page screen then proceed to solve the error.
Such as "xxxx.rpyc and xxxx.rpy can't exist at the same time" all you have to do is delete either of the two.
If you still can't, maybe try to update your joiplay to the latest version from the p site